Method and apparatus for extracting information-bearing portions of a signal for recognizing varying instances of similar patterns

(19)

(11)

EP 0 411 290 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	09.02.1994 Bulletin 1994/06

(43)	Date of publication A2:
	06.02.1991 Bulletin 1991/06

(21)	Application number: 90111563.4

(22)	Date of filing: 19.06.1990

(51)	International Patent Classification (IPC)⁵: G10L 5/06, G10L 9/00, G10L 3/00

(84)	Designated Contracting States:
	AT BE CH DE ES FR GB IT LI NL SE

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Priority:

04.08.1989 US 389682

(71)	Applicant: SCOTT INSTRUMENTS CORPORATION
	Denton Texas 76201 (US)

(72)	Inventors:
	Scott, Brian Lee Denton, Texas 76205 (US) Newell, John Mark Denton, Texas 76205 (US) Smith, Lloyd Alan Denton, Texas 76205 (US) Lin, Lisan Soapi Denton, Texas 76205 (US)

(74)	Representative: UEXKÜLL & STOLBERG
	Patentanwälte Beselerstrasse 4 22607 Hamburg 22607 Hamburg (DE)

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References cited: :

(54)	Method and apparatus for extracting information-bearing portions of a signal for recognizing varying instances of similar patterns

(57) A method and apparatus for extracting information-bearing portions of an input signal from which is calculated a sliding average magnitude difference function (SAMDF). The signal is coupled to three separate data channels. Each channel is logarithmically spaced from the adjacent channel and time and amplitude normalized to generate a data template containing the information-bearing portions of the signal. In addition, a fourth channel is derived from the first three. Sixteen data measurements are taken, four from each of the four channels with three additional data measurements being derived from the energy envelope of the information-bearing portion of the input signal. The 19 total data measurements represent the amplitude normalized envelope of the signal.

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